When Emacs first visits an Org file, the global state is set to
OVERVIEW, i.e., only the top level headlines are visible6. This
can be configured through the variable
org-startup-folded, or on
a per-file basis by adding one of the following lines anywhere in the
#+STARTUP: overview #+STARTUP: content #+STARTUP: showall #+STARTUP: showeverything
Furthermore, any entries with a ‘VISIBILITY’ property (see Properties and Columns) get their visibility adapted accordingly. Allowed values for this property are ‘folded’, ‘children’, ‘content’, and ‘all’.
Switch back to the startup visibility of the buffer, i.e., whatever is requested by startup options and ‘VISIBILITY’ properties in individual entries.